diff --git a/src/Api/Controllers/CiphersController.cs b/src/Api/Controllers/CiphersController.cs
index 59e3989d9e..626084e0d1 100644
--- a/src/Api/Controllers/CiphersController.cs
+++ b/src/Api/Controllers/CiphersController.cs
@@ -97,7 +97,7 @@ namespace Bit.Api.Controllers
             var ciphers = await _cipherRepository.GetManyByUserIdHasCollectionsAsync(userId);
 
             var collectionCiphers = await _collectionCipherRepository.GetManyByUserIdAsync(userId);
-            var collectionCiphersGroupDict = collectionCiphers.GroupBy(s => s.CipherId).ToDictionary(s => s.Key);
+            var collectionCiphersGroupDict = collectionCiphers.GroupBy(c => c.CipherId).ToDictionary(s => s.Key);
 
             var responses = ciphers.Select(c => new CipherDetailsResponseModel(c, collectionCiphersGroupDict));
             return new ListResponseModel<CipherDetailsResponseModel>(responses);
@@ -116,7 +116,7 @@ namespace Bit.Api.Controllers
             var ciphers = await _cipherRepository.GetManyByOrganizationIdAsync(orgIdGuid);
 
             var collectionCiphers = await _collectionCipherRepository.GetManyByOrganizationIdAsync(orgIdGuid);
-            var collectionCiphersGroupDict = collectionCiphers.GroupBy(s => s.CipherId).ToDictionary(s => s.Key);
+            var collectionCiphersGroupDict = collectionCiphers.GroupBy(c => c.CipherId).ToDictionary(s => s.Key);
 
             var responses = ciphers.Select(c => new CipherMiniDetailsResponseModel(c, collectionCiphersGroupDict));
             return new ListResponseModel<CipherMiniDetailsResponseModel>(responses);
@@ -134,7 +134,7 @@ namespace Bit.Api.Controllers
         {
             var userId = _userService.GetProperUserId(User).Value;
             var folderCiphers = model.Folders.Select(f => f.ToFolder(userId)).ToList();
-            var otherCiphers = model.Logins.Select(s => s.ToCipherDetails(userId)).ToList();
+            var otherCiphers = model.Logins.Select(l => l.ToCipherDetails(userId)).ToList();
 
             await _cipherService.ImportCiphersAsync(
                 folderCiphers,
@@ -179,7 +179,7 @@ namespace Bit.Api.Controllers
             }
 
             await _cipherService.ShareAsync(model.Cipher.ToCipher(cipher), new Guid(model.Cipher.OrganizationId),
-                model.CollectionIds.Select(s => new Guid(s)), userId);
+                model.CollectionIds.Select(c => new Guid(c)), userId);
         }
 
         [HttpPut("{id}/collections")]
@@ -194,7 +194,7 @@ namespace Bit.Api.Controllers
                 throw new NotFoundException();
             }
 
-            await _cipherService.SaveCollectionsAsync(cipher, model.CollectionIds.Select(s => new Guid(s)), userId, false);
+            await _cipherService.SaveCollectionsAsync(cipher, model.CollectionIds.Select(c => new Guid(c)), userId, false);
         }
 
         [HttpPut("{id}/collections-admin")]
@@ -209,7 +209,7 @@ namespace Bit.Api.Controllers
                 throw new NotFoundException();
             }
 
-            await _cipherService.SaveCollectionsAsync(cipher, model.CollectionIds.Select(s => new Guid(s)), userId, true);
+            await _cipherService.SaveCollectionsAsync(cipher, model.CollectionIds.Select(c => new Guid(c)), userId, true);
         }
 
         [HttpDelete("{id}")]
diff --git a/src/Api/Controllers/CollectionUsersController.cs b/src/Api/Controllers/CollectionUsersController.cs
index 192b2a48ac..58f52a751c 100644
--- a/src/Api/Controllers/CollectionUsersController.cs
+++ b/src/Api/Controllers/CollectionUsersController.cs
@@ -43,7 +43,7 @@ namespace Bit.Api.Controllers
             }
 
             var collectionUsers = await _collectionUserRepository.GetManyDetailsByCollectionIdAsync(collectionIdGuid);
-            var responses = collectionUsers.Select(s => new CollectionUserResponseModel(s));
+            var responses = collectionUsers.Select(c => new CollectionUserResponseModel(c));
             return new ListResponseModel<CollectionUserResponseModel>(responses);
         }
 
diff --git a/src/Api/Controllers/CollectionsController.cs b/src/Api/Controllers/CollectionsController.cs
index 37dbd0365c..2f4bf88e6c 100644
--- a/src/Api/Controllers/CollectionsController.cs
+++ b/src/Api/Controllers/CollectionsController.cs
@@ -54,7 +54,7 @@ namespace Bit.Api.Controllers
             }
 
             var collections = await _collectionRepository.GetManyByOrganizationIdAsync(orgIdGuid);
-            var responses = collections.Select(s => new CollectionResponseModel(s));
+            var responses = collections.Select(c => new CollectionResponseModel(c));
             return new ListResponseModel<CollectionResponseModel>(responses);
         }
 
@@ -62,7 +62,7 @@ namespace Bit.Api.Controllers
         public async Task<ListResponseModel<CollectionResponseModel>> GetUser()
         {
             var collections = await _collectionRepository.GetManyByUserIdAsync(_userService.GetProperUserId(User).Value);
-            var responses = collections.Select(s => new CollectionResponseModel(s));
+            var responses = collections.Select(c => new CollectionResponseModel(c));
             return new ListResponseModel<CollectionResponseModel>(responses);
         }
 
diff --git a/src/Api/Controllers/LoginsController.cs b/src/Api/Controllers/LoginsController.cs
index 984bccd81e..72ddc9a733 100644
--- a/src/Api/Controllers/LoginsController.cs
+++ b/src/Api/Controllers/LoginsController.cs
@@ -50,7 +50,7 @@ namespace Bit.Api.Controllers
             var userId = _userService.GetProperUserId(User).Value;
             var logins = await _cipherRepository.GetManyByTypeAndUserIdAsync(Core.Enums.CipherType.Login,
                 userId);
-            var responses = logins.Select(s => new LoginResponseModel(s)).ToList();
+            var responses = logins.Select(l => new LoginResponseModel(l)).ToList();
             return new ListResponseModel<LoginResponseModel>(responses);
         }
 
diff --git a/src/Api/Controllers/OrganizationUsersController.cs b/src/Api/Controllers/OrganizationUsersController.cs
index 2c25fffd1d..7ec038888f 100644
--- a/src/Api/Controllers/OrganizationUsersController.cs
+++ b/src/Api/Controllers/OrganizationUsersController.cs
@@ -75,7 +75,7 @@ namespace Bit.Api.Controllers
 
             var userId = _userService.GetProperUserId(User);
             var result = await _organizationService.InviteUserAsync(orgGuidId, userId.Value, model.Email, model.Type.Value,
-                model.AccessAllCollections, model.Collections?.Select(s => s.ToCollectionUser()));
+                model.AccessAllCollections, model.Collections?.Select(c => c.ToCollectionUser()));
         }
 
         [HttpPut("{id}/reinvite")]
@@ -132,7 +132,7 @@ namespace Bit.Api.Controllers
 
             var userId = _userService.GetProperUserId(User);
             await _organizationService.SaveUserAsync(model.ToOrganizationUser(organizationUser), userId.Value,
-                model.Collections?.Select(s => s.ToCollectionUser()));
+                model.Collections?.Select(c => c.ToCollectionUser()));
         }
 
         [HttpDelete("{id}")]
diff --git a/src/Core/Models/Api/Request/CollectionUserRequestModel.cs b/src/Core/Models/Api/Request/CollectionUserRequestModel.cs
index 4114b07bc4..869299e567 100644
--- a/src/Core/Models/Api/Request/CollectionUserRequestModel.cs
+++ b/src/Core/Models/Api/Request/CollectionUserRequestModel.cs
@@ -12,11 +12,11 @@ namespace Bit.Core.Models.Api
 
         public IEnumerable<CollectionUser> ToCollectionUsers()
         {
-            return Collections.Select(s => new CollectionUser
+            return Collections.Select(c => new CollectionUser
             {
                 OrganizationUserId = new Guid(UserId),
-                CollectionId = new Guid(s.CollectionId),
-                ReadOnly = s.ReadOnly
+                CollectionId = new Guid(c.CollectionId),
+                ReadOnly = c.ReadOnly
             });
         }
 
diff --git a/src/Core/Models/Api/Response/CipherResponseModel.cs b/src/Core/Models/Api/Response/CipherResponseModel.cs
index 95566868e3..0d0e77eb1b 100644
--- a/src/Core/Models/Api/Response/CipherResponseModel.cs
+++ b/src/Core/Models/Api/Response/CipherResponseModel.cs
@@ -79,7 +79,7 @@ namespace Bit.Core.Models.Api
         {
             if(collectionCiphers.ContainsKey(cipher.Id))
             {
-                CollectionIds = collectionCiphers[cipher.Id].Select(s => s.CollectionId);
+                CollectionIds = collectionCiphers[cipher.Id].Select(c => c.CollectionId);
             }
             else
             {
@@ -91,7 +91,7 @@ namespace Bit.Core.Models.Api
             string obj = "cipherDetails")
             : base(cipher, obj)
         {
-            CollectionIds = collectionCiphers.Select(s => s.CollectionId);
+            CollectionIds = collectionCiphers.Select(c => c.CollectionId);
         }
 
         public IEnumerable<Guid> CollectionIds { get; set; }
@@ -105,7 +105,7 @@ namespace Bit.Core.Models.Api
         {
             if(collectionCiphers.ContainsKey(cipher.Id))
             {
-                CollectionIds = collectionCiphers[cipher.Id].Select(s => s.CollectionId);
+                CollectionIds = collectionCiphers[cipher.Id].Select(c => c.CollectionId);
             }
             else
             {
diff --git a/src/Core/Models/Api/Response/OrganizationUserResponseModel.cs b/src/Core/Models/Api/Response/OrganizationUserResponseModel.cs
index 1c9ce1dfe7..2f51ec47f4 100644
--- a/src/Core/Models/Api/Response/OrganizationUserResponseModel.cs
+++ b/src/Core/Models/Api/Response/OrganizationUserResponseModel.cs
@@ -41,7 +41,7 @@ namespace Bit.Core.Models.Api
             : base(organizationUser, "organizationUserDetails")
         {
             Collections = new ListResponseModel<OrganizationUserCollectionResponseModel>(
-                collections.Select(s => new OrganizationUserCollectionResponseModel(s)));
+                collections.Select(c => new OrganizationUserCollectionResponseModel(c)));
         }
 
         public ListResponseModel<OrganizationUserCollectionResponseModel> Collections { get; set; }
diff --git a/src/Core/Services/Implementations/OrganizationService.cs b/src/Core/Services/Implementations/OrganizationService.cs
index 069e5cba5b..665b74a78b 100644
--- a/src/Core/Services/Implementations/OrganizationService.cs
+++ b/src/Core/Services/Implementations/OrganizationService.cs
@@ -900,10 +900,10 @@ namespace Bit.Core.Services
             var currentUserCollections = newUser ? null : await _collectionUserRepository.GetManyByOrganizationUserIdAsync(user.Id);
 
             // Let's make sure all these belong to this user and organization.
-            var filteredCollections = collections.Where(s => orgCollections.Any(os => os.Id == s.CollectionId));
+            var filteredCollections = collections.Where(c => orgCollections.Any(os => os.Id == c.CollectionId));
             foreach(var collection in filteredCollections)
             {
-                var existingCollectionUser = currentUserCollections?.FirstOrDefault(cs => cs.CollectionId == collection.CollectionId);
+                var existingCollectionUser = currentUserCollections?.FirstOrDefault(cu => cu.CollectionId == collection.CollectionId);
                 if(existingCollectionUser != null)
                 {
                     collection.Id = existingCollectionUser.Id;
@@ -916,8 +916,8 @@ namespace Bit.Core.Services
 
             if(!newUser)
             {
-                var collectionsToDelete = currentUserCollections.Where(cs =>
-                    !filteredCollections.Any(s => s.CollectionId == cs.CollectionId));
+                var collectionsToDelete = currentUserCollections.Where(cu =>
+                    !filteredCollections.Any(c => c.CollectionId == cu.CollectionId));
                 foreach(var collection in collectionsToDelete)
                 {
                     await _collectionUserRepository.DeleteAsync(collection);